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第83章 地形沙盘

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徐平本来并没有想如此麻烦,不过这次有王沿与自己死顶,不敢大意,这才在后半段紧急制作了这沙盘出来。为了赶时间,沙盘是用胶泥制作,把从汴口开始,黄河以南嵩山以北的地形都表示了出来,黄河沿线一带制作得尤为精致。

揭开沙盘上盖着的绸布,徐平道:“诸位看,这是从汴口往上到洛水入河口一带的地形,山川岗丘,都在其中。不同的地段,地下是山石还是沙土,都用不同的颜色标记得清楚。黑色的是山石,白色的是沙土,颜色愈深则地下越硬,相应地也越是难以开凿,颜色浅的则开挖起来就容易。须水、索水以南的嵩山与开挖河渠无涉,便就没有上色,不需要去管。”

吕夷简和王曾对视了一眼,徐平每次谈起这种正经事来,总是要弄些稀奇花样出来。什么一大堆图表,在黑板上画图,这次连沙盘都搬出来了。这些办法麻烦是真麻烦,但也确实看得清楚,容易理解。说实话,在座的几人虽然都是朝堂地方辗转多年为官,对这些专业的知识可没几个人懂。单单靠说,能听个大概就了不起了,怎么能够真地分清利弊?这样做,好处也是很明显的。

赵祯在上面,伸着脖子看了一会,离得远了哪里能够看得清?干脆站起身来,对座下的一众大臣道:“诸位还是都起身,到前边看得清楚些。”

吕夷简和王曾都早已经知道会是这个结果,听了赵祯的话,带着臣僚站起身来。

到了沙盘前,才看清楚这沙盘制得极为精致,不但是栩栩如生,色彩分明,在沙盘的边上还立得有标杆。

梅询看了一会,问一边站着的徐平:“徐待制,这两条标杆是做什么用的?怎么上面只刻了几条线?难不成还能标记里数不成?”

“回学士,正是用来标记里数的。这标杆上的一小格便是一里,整个沙盘都是用这比例制作。平的一小格便是平地一里,坚的一小格便是高一里。”

梅询与身边的晏殊对视着笑了起来,口中道:“难不成你这沙盘还真地跟实际地理一样?在这上面距离远近,山高山低都能一眼看得出来?”

徐平点头:“正是!”

听了这话,围着的人面色都变了,表情不由得郑重起来。这沙盘原来不仅仅是示意,竟然真地是按照比例制出来的。不说河道勘查得如何,单单费心制作出这样一副沙盘来,就很了不得了。中国早已经有了记里鼓车,平地上的里数好计算,但山的高度量起来可不容易。别看从《山海经》起就动不动说哪座山有多高,但要真地把一座山的高度量出来,可不是随便什么人都能做到的事。

徐平事前对此也没有准备,没有专用的工具,再是用心,实际上还是很粗略。他取的基准是黄河的水面,而黄河上下游是有高度差的,再加上地球是圆形,自然便就有曲率的影响,这两项的误差是骨子里带来的。

没有光学仪器,纯靠着人多用立杆拉绳的方法硬来,然后测量角度计算,便只能尽量少地取一些标志点,大多还是靠估计。

但是不管怎样,这已经是这个年代最精细的立体地形图了。

(以前是睡不着,现在是醒不了,迷迷糊糊了近四十个小时,还是觉得晕啊……)

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